Flying people and some can't build

So... Right now happened critical error on serevr...

People respawn in the middle of the map on height 2000... And who on the land - can't build... WTF?

 

Map size?

 

6000
[DOUBLEPOST=1424121416][/DOUBLEPOST]

Please, help

 

It happens when your map is to large. Decrease to below 5000

 

Really? This is not a plugin problems?

But before was ok (1 week)...

 

If I change to 5000 - will this happe

Thanks, waiting for your updated CommandBlock...